.container {
    margin: auto;
    width: 330px;
    height: 500px;
    position: relative;
    margin-top: 150px;
    text-align: center;
}

#retreat {
    position: absolute;
    top: 50px;
    right: 15px;
    width: 75px;
}

input {
    width: 300px;
    height: 50px;
    font-size: 2em;
}

td {
    width: 75px;
    background-color: rgba(235, 232, 232, 0.7);
}

td:hover {
    background-color: rgba(212, 212, 212, 1);
}

td:active {
    background-color: yellow;
}

input {
    text-align: right;
}

#screen {
    display: none;
}